#include "book.h"
#include "publication.h"
#include "tape.h"
#include <iostream>
using namespace std;

int main() {
  Publication publication("example title", "example name", 20, 1523710864);
  publication.display();
  Book book(publication, 10);
  book.display();
  Tape tape(publication, 22);
  tape.display();
  return 0;
}